Set Kind on skaffold init

[dgageot]

Fixes #1236

[codecov-io]

Codecov Report

Merging #1237 into master will increase coverage by 0.72%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1237      +/-   ##
==========================================
+ Coverage   41.45%   42.17%   +0.72%     
==========================================
  Files          96       96              
  Lines        4238     4239       +1     
==========================================
+ Hits         1757     1788      +31     
+ Misses       2310     2277      -33     
- Partials      171      174       +3

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/init.go	15.89% <100%> (+15.89%)	⬆️

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